Millivolt Control System; Maintenance And Servicing; Maintenance Checklist; Glass Maintenance - Lennox Hearth Products Elite Series Installation And Operation Manual

Millivolt Control System
This insert operates on a millivolt control
system. As such, no addition power sup-
ply is needed for the insert to operate. The
pilot assembly contains a Thermopile, that
when heated by the pilot flame, generates
electricity (millivolts, mV=1/1000 of a volt)
that travels to terminal #1. From this terminal
it travels through a black wire to the Vent
Safety Snap Switch. If this switch overheats
through a flue blockage or vent pipe discon-
nection it will open, stop the flow of mV and
shut the insert off. This switch will automati-
cally reset (close), when it is cooled down
to normal operating temperature. During
normal operation, it is closed allowing the
mV to flow back to the valve, which opens
so gas can flow through.
Millivolt and System Checks
Check To
Test Test
A Complete
System
B Thermopile
Output
C System
Resistance
MAINTENANCE AND SERVICING
Maintenance Checklist
Should Only Be Performed by a Qualified Service Technician.
CAUTION: Label all wires prior to disconnection when servic-
ing controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
1. Annual inspection should be made and the following checks per-
formed:
a) With unit cool, remove glass and inspect burner for dirt, soot and lint
accumulations and remove if necessary. If excessive soot accumula-
tion is present on burner, have a qualified serviceman adjust burner
for proper combustion.
b) Clean any deposits from inside glass with gas fireplace glass cleaner.
NEVER attempt to remove or clean glass when the unit is hot.
c) Check the hot air outlet vents to make sure they are free from lint or
other accumulations. Never block or restrict vent openings or use
vents other than Lennox™ products.
d) Check that chimney and its outlet are open and free from soot, block-
age, or debris.
18
Millivolt Control Schematic
Valve Terminals
Terminal
Figure 21
Connect Thermostat Meter Read-
Meter Connects
Leads to Should Be
Terminals
 & 3 Closed 100 MV
or More
1 &  Open Greater Than
35 MV
 & 3 Closed .5 Ohms
PIEZO IGNITER
3
MANIFOLD PRESSURE TAP
GAS
INLET
INLET PRESSURE TAP
VENT SAFETY
SNAP SWITCH
e) Inspect the pilot system for proper flame. See instructions on Page
16.
ing
f) Check the Millivolt system as per the table on Page 17.
g) The appliance area must be kept clear and free of combustible materi-
als, gasoline and other flammable vapors and liquids.
h) Check glass gaskets once a year. Gaskets must be tight. Replace if
necessary.
. The viewing glass should be cleaned periodically (see Glass Main-
tenance).
Glass Maintenance
Cleaning:
When cool, the glass may be cleaned with a clean, soft cloth
and a household glass cleaner. For cleaning white condensation from the
interior glass, use a gas fireplace glass cleaner available from your insert
dealer. Use of caustic or abrasive cleaners may damage the glass. DO
NOT operate the insert with broken glass. DO NOT clean door or glass
when hot. DO NOT abuse the glass door by striking or slamming it shut.
DO NOT use substitute materials if replacing the glass. DO NOT spray
commercial glass cleaner with ammonia on the door and glass gasket
as it may dissolve the gasket glue.
Replacement:
The glass in the insert door cannot be replaced separately.
Should the glass be damaged, the entire glass, gasket and metal frame
assembly must be replaced as a unit. This replacement glass assembly
is available from your Lennox Hearth Products dealer. The glass is neo-
ceramic and alternative types must not be used.
WARNING: Do not operate appliance with the glass panel
removed, cracked, or broken. Do not remove glass door while
the insert is hot. Replacement of the glass door should be done
by a qualified service technician.
PILOT
SPARKER
THERMOPILE
PILOT TUBE
3
2
1
ON/OFF ROCKER SWITCH,
THERMOSTAT, or REMOTE
THERMOSTAT